Boiler



W. B. MACK.

(No Model.)

BOILEB..

Patented uly 31, 1888.

WITNEEEEE:

there STATES PATENT Frrcn.

\VILLIAM B. MACK, OF BOSTON, MASSACHUSETTS.

. BOILER.

SPECIFICATION forming part of Letters Patent No. 386,998, dated July 31,1888.

Application tiled August 20, 1887.

To all whom, it may concern:

Be it known that l, WILLIAM B. MACK, of Boston, in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Boilers for Heating and SteanrG enerating Apparatus,ofwhich the following is a specification.

My invention relates to boilers or contrivanees for heating water forthe purpose of leating or warming apartments of buildings,

My invention will first be fully described, and then pointed out withparticularity in the claim.

Reference is to be had to the accompanying drawings, and to the lettersof reference marked thereon, forming a part of this specication, thesame letters designating the same parts wherever they occur.

Of the drawings, Figure l represents a front view of my improved boilerand a portion of its appurtenances. Fig. 2 represents an end or sideView of the same. Fig. 3 represents a vertical sectional View of aportion of Fig. l, parts being shown as broken out. Figs. 4 and 5represent vertical sectional views similar to Fig. 3, showing modifiedconstructions of the invention.

In carrying out my invention I construct the return-tubes a. a ofwrought-iron, preferA ably bending the same at the return-point b, andflaring or Hanging their connecting ends, as at c c.

d designates the main or connecting tubes, adapted to be built into thebrick-work o'r wall of the furnace, and constructed in sections, as mostclearly shown in Figs. 3, 4, and 5, each section being provided with apartition, e, which cuts off direct communication between the connectingends of the returntubes, so as to make certain of the circulation of thewater in the boiler through the returntubes and connections or mains.

The return-tubes are first constructed and their daring or iianged endsc placed in proper position in the molds for the main or connectingsections d, and the latter cast thereon. In this way an absolutely waterand steam tight joint is secured between said sections and return-tubes.It is preferred to tin the ends of the tubes before they are put intothe Serial No. 247,423. (No model.)

molds. Each section d, excepting the lower section, is east with aliange, f, on each end, one of which lianges has a wedge-shaped rib, g,formed thereon, which rib is adapted to enter a groove or depressedseat, l1, of approximately the same shape as said rib, formed in theadjacent flange of the next section, so that when the two sections arebolted together through the flanges fthe rib g will be drawn and wedgedinto the groove It, so as to form a perfectly water-tightjoint at thispoint. The lowerend,t, of the lower section is closed, as shown in Fig.3, and is provided with an inlet-port, 7, as shown, for the admission ofwater. This inlet-port communicates with a supply-pipe, k, which iscommon to the several tiers of returntubes, constructed as has beendescribed, and the several connectingmains d communicate with a commonreceiving-reservoir, l, whence the heated water rises through thedischarge-pipe m to the registers or the like, to be returned again tothe supplypipe k to be rcheated.

Vhen the apparatus is employed for generating steam, a return-pipe, c,will be eonnected with the reservoir and supply-pipe lr, as indicated indotted lines in Fig. 2.

Instead of bending the return-tubes, as at the point b, said tubes maybe made as sepa rate parts and the several pairs connected by means of aseparately formed crook7 or bow7 connection or coupling, n, as shown inFig. 4; or separate connecting-sections 0, similar to the sectionscomprising the connecting-sections d, may be cast on the ends of thereturn-tubes b, as shown in Fig. 5. In this case each section o willhave one end p closed, which closed and projecting end may be so formedas to be closely seated in adepression, q, formed in the adjacent end ofthe next section. In this way the tiers of return-tubes may readily bebuilt to any desired height, and any desired number of tiers may in likemanner loe attached to the su pply-main k, through the tubes of all ofwhich tiers the water will circulate constantly while there is heat inthe furnace.

It is obvious that changes may be made in the form and arrangement ofparts constituting my invention without departing from the nature orspirit thereof.

I claimd- The combinatiomwithapair of return-tubes, of a,connecting-section, d, to which said'tubes are attached, saidconnecting-section being 5 provided with a partition, e, at acentralpoint, and nn one end with a rib, g, and on the other end with a. grooveor depressed seat, 7L, as set forth.

In testimony Whereof have signed my name to this specioation, in thepresence o'f two :o subscribingwitnesses, this 9th day of August, A. D.1887.

WILLIAM B. MACK.

Witnesses:

ARTHUR W. CRossLEY, O. F. BROWN.

